Wikipedia articles on atmospheric optics are of uneven reliability.Eye Care Marvels of atmospheric optics feed through our eyes. Many hover close to the bright sun and
exceptional care must be taken to protect our most valuable sense. Always hide the sun behind a tree or building. Never, ever, look directly at the sun and certainly not through binoculars
no matter how dim it appears in visible light. It can still be emitting copious retina burning infra-red.Key tips to protect your vision - Gregory Miller